|National origin||United States|
The Stearman XBT-17 was a prototype 1940s American two-seat low-wing monoplane primary trainer designed and built by Stearman Aircraft (as the Model X-90). It was evaluated by the United States Army Air Force in 1942 as the XBT-17.
Design and development
The X-90 was a low-wing cantilever monoplane with two-seats in tandem under an enclosed canopy. It had a fixed Conventional landing gear and was powered by a 225 hp (168 kW) Lycoming R-680 engine and first flew in 1940. It had wooden wings and a steel tube forward fuselage in order minimise use of aluminium. In 1942 the aircraft was re-engined with a 450 hp (336 kW) Pratt & Whitney R-985 engine and re-designated the Model X-91. The X-91 was evaluated by the United States Army Air Force as the XBT-17 but no more were built.
- Stearman X-90
- Prototype basic trainer with a 225 hp (168 kW) Lycoming R-680 engine.
- Stearman X-91
- The X-90 re-engined with a 450 hp (336 kW) Pratt & Whitney R-985 engine for USAAF evaluation.
- Stearman XBT-17
- United States Army Air Force designation for the X-91.
Data from 
- Crew: 2
- Length: 27 ft 9 in (8.46 m)
- Wingspan: 35 ft 9 in (10.90 m)
- Wing area: 200 sq ft (19 m2)
- Empty weight: 3,080 lb (1,397 kg)
- Gross weight: 4,150 lb (1,882 kg)
- Powerplant: 1 × Pratt & Whitney R-985-AN-1 , 450 hp (340 kW)
- Maximum speed: 190 mph (306 km/h; 165 kn)
- Cruise speed: 160 mph (139 kn; 257 km/h)
- Service ceiling: 20,000 ft (6,096 m)
- Rate of climb: 1,300 ft/min (6.6 m/s)
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